Disintegrating or pulverizing apparatus



Dec. 7 1926. y 1,609,299 J. E. KENNEDY msiu'rmnnmepn PULVERIZING APPARATUS Filed Oct. 16. 1922 4 Sheets-Sheet'l v E (June/W601 ennegly -Dec. 7 1926.

. J. E. KENNEDY DIS-INTEGRATING 0R PULVERIZING APPARATUS Filed Oct; 16. 1922 4 sheets-sheet 2 Dec. 7 1926.

PDTSINTEGRATING OR PULVERIZING APPARATUS Filed oct. 16. 1922 J. E. KENNEDY 4 Sheets-Sheet 3 Dec. 7 1926.

J. E. KENNEDY D ISI NTEGRATING OR PULVERIZING APPARATUS -4 Sheet s-Sheet 4 auoehtoz J: .nngzy 7H5 guy/mug Patent Dec.

M E i JOSEPH n'xmmnnr, or new yonx, N. Y.

nrsmrneaarme on runvnarziue 'A'rPAaA'rus.

Application filed October is, 1922. Serial no. teases.

This invention relates to apparatus for disintegrating or pulverizlng material such as coal, lignite, ore, rock, bone, etc., and relates particularly to a paratus of this charmeans, to arrange in the connection of the suction means and receiver means to separate coarse particles or unpulverized material from the material dellvered by the suction means and return the same to the pul-' verizing drum and to provide regulable means to control the influx ofair to and the efilux of air from the drum" and thereby the constant delivery of disintegrated material of predetermined uniform finenesses.

It is another object of the invention to provide an apparatus ,of this character wherein freely moving grindln elements are contained within a drum an the latter having charging and delivery openings at opposite ends of an improved construction.

prevent theand arrangement of drum to I delivery through the drum openings of material being ground or the grinding elements by the cascading movement thereof during the revolving of the drum by arranging the openings of the drum at such an angle relative to the axis of the drum whereby material entering said openings from the drum is re-entered into the drum. 7

It is a further object of the invention to provide an apparatus of this character in which a cylindrical drum having grinding elements therein and arranged with charging and delivery openings at opposite ends is connected in circulation with pneumatic or suction delivery means for the disintegrated material, of means to deliver material to the drumwithoutimpairing the action of the suction or pneumatic means.

Another object of my invention relates to an improved construction and arrangement of adjustable separator for connection in the delivery of the suction means whereby to separate material ofvarying degrees offineness from the material delivered by the suction means from the grindin drum. c

It is a further object of tfie invention to provide a gulverizing apparatus in which a grinding rum is connected in circuit with pneumaticor suction means to arrange in the circuit with the suction or pneumatic means at the deliver side thereof, means to reduce the force of tii I means in successive steps to separate material from the air in varying degrees of fineness at said successive steps in the reduction of the airforee. i

e air delivered; by the suction Other objects and advantageswillihere:

inafter ap car.

In the rawings accompanyin and form-' I ing apart of-t-hls specification, a rear eleyation of disintegrating izlng apparatus illustrating in a igure' 1 is or pulverapparatus embodying my invention.

Figure 2 is a sectional side elevation on an enlarged scale-relative to Fi ure 1 showing my improved arrangement of drum together wlth the connection thereof in circulation with suction or pneumatic means and the means to feed material to the drum without impairing the action of the suction or pneumatic means.

Figure 3 is a of Figure 2.

Figure 4 is a side elevation, partly in section, of my improved, adjustable separator plan view lookingat the top diagram mat1c manner an installation of 'pulverizmg whereby to separate material of varying de-.

grees of fineness from the air delivered by the suction .means from the drum.

.Figure 5 is Figure 4; and

Figures 6 and 7 are plan and front elevational views respectively illustrating "in a diagrammatic manner a modified installation of my improved means and method of reducing the force of the air delivered by the suction means at successive stagesor steps and delivering the material at one of said a view looking at the top of] steps of a difi'erent fineness than at the other ste s. 5,; -imilar characters ofreference designate like (parts throughoutfthe difierent views of the rawing's.

The embodiment of my invention shown in i the drawings comprises a tubular or cylindrical drum D hav" hollowtrunnions 4, 5 at op osite 811118 131 1 5 axiall of the drum where y the drum is revolub y supportedin bearin s in pillow blocks 6, mounted upon a suite. la base B, shown in'the present instance as a concrete base.

' serves as" a feeding ening for the drum made of considera means on the interior of t e feeding trunwhile the trunnion is the delivery outlet for disintegrated .or pulverized material.

The drum is driven in a suitable manner as by an annular gear 8 mounted upon the 'drum meshing with a pinion 8 fixed to a. shaft '9' driven from a suitable source of.

ower by a belt passing around a pulley P. rums in apparatus of this character are of large size and great weight ;-particularly when loaded with grinding elements and the material to be ground; eretofore to provide large bearing surfaces for the trunnion supports to compensate for wear and obviate the necessity offreducing the capacity of the drum the sup e len h necessitat ng nion operative to deliver material therethrough to the drum during the revolution of the latter; In commercial mills of this To obviate the necessity of arranging con-' charged throu character the disinte rated material is dish the elivery trunnion means being provide in the drum to lift the ma teria rombelow to above the axis of the drum and direct the elevated material to such trunnion with means arranged in the trunnion to convey the material therethrough.

veying means in the trunnions to chargeematerial to and deliver pulverized material'- 35 from the drum andalso providelarge bearing surfaces the trunnions 4, 5 aremade' of v large. diameter relative to the size of the drum. These trunnions are'constructed intrunnions and to maintain t e capacity of the drum in the use of the large trunions as above set forth, reducers in" the form of an- I 150 nular members to engage within thetrun nion openings are provided, said reducers being arranged with a wall extending at an angle totthe axis of the drum to re-enter Imaterial 'enterin'g said 'openings into the the peripheral portion to drum. In the present instance-these mem--: bers COIIIPIISG' an annular connected at ends of the trunnions and the openings in said plates are whereby they are detacha t e the trunnions, an annular web extending and diverging inwardly toward the drum from the opening of said plate ortion with the diameter of such webs: at t e inner and substantially the same as the diameter of the The trunnion t orting trunnions were in the de and confined between the lugs 21 an plate portion 9 force of t trunnion o ening at the inner end as clearly shown in igure 2: Grinding means within the drum operates through the movement of the drum to have movement im arted thereto relative to the drum to grin or pulverize material in the drum and consists of freely moving elements shown in the pre:ent instance as metalhcballs. By the arrangement of the reducers'for thetrunnion openings as the drum is. revolved and the rinding elements as well as the material ing ground-cascades in the drum any of the grinding elements or material which enters the openin s' in said reducers is directed back mto-t edrum.

' To" deliver disintegrated or pulverized material from the drumit is connected in substantially airtight circulation with pneumatic or suction means 0 erative to draw air from and-through the rum and therewith the pulverized material. This pneumatic means comprises a rotary suction fan (des- 'ignated in a general way by F) the 0 erative element of which is drivenby a sit --(not shown) from a suitable source of power passed around a pulley v11 mounted on a shaft 12, carrying the operative fan element,

- ournaled in bearing members 13 mounted upon the base B.

The intake ofthe throng a receptacle 'oricasin .14: mounted upon the base B, the fan being connected thereto, as at 15,in alinement with the axis of the drum, the latter having a substantial- 1y air-tight connection with the receptacle. For this purpose the plate 9 of the reducer ivery.trunnion.5 has an axialcylindrical extension 16 having a sliding joint connection with a flange 17 extending around the inlet of the casing 14, said-joint consist ing of a flan ed sleeve or collar 18en aging the -fian e I of the receptacle ,14 sfidably mounte on the sleeve 16 of the trunnion reducer and connected to headed pins or bolts 20 slidably engafiing in openings in lugs 21 extending latera y from the sleeve 16,.said

collar being urged outward against the flange 17 by springs 22 coiled about the dpins the sleeve. Y

' .The delivery of the fan has a pipe 23 leadfan isconnec ted m'th deliver outlet of the pulverizing drum D ing therefrom for the delivery of pulverized orcomminuted material drawn from the drum to aseparator-(designated in a gen-.

eral way by S), said pipe being connected to said separator adjacent the top. The

duced as it enters'the separator S whereby any particles orcoarse material drawn ofi t e air laden with the material drawn oif from the drum is somewhat reof reduced size relative to the openings in,

- necte havin an outlet to which a pipe 24 is conto deliver such particles or coarse material to the charging opening of the drum in a manner as hereinafter set forth. j The separator S has a pipe 25 leading from the top to a closed receiver hopper 26 for the collection of the pulverized or'powdered material carried by the air, and conneeted preferably adjacent the top thereof.

stantially air-tight connection with the charging trunnion of the drum in a manner similar to the connection of the rece taele- 14 with the delivery trunnion of the rum,

and consists of .a sleeve or collar 30 slidably mounted on an axial tubular extension 32 of the plate portion 9 of the trunnion reducer of the charging opening of the drum and connected to headed pins or bolts 33 slidably engaging in openings in lugs or ears 34 extending laterally from the reducer extension 32 anduirged outward by springs 35 coiled about the pins 33 and confined between the lugs 34and thesleeve 30; The sleeve or collar 30 has a' 'rubbing contact with flange 36 extending around the outlet of the receptacle 29. The receiver 26 being of relatively large size the force of the air delivered thereto is materially decreased with the result that the pulverized material carried by the air in the form of dust settles in the receiver while the freed air passes out through. the outlet pipe 28 and re-entered into the drum by the suction of the fan and under certain conditions is re-entered into the drum by the force of the air delivered by the fan, where it acts, due to the flaring wall 10 of the reducer in the trunnion openings, to create an agitation of the air within the drum which causes the air to more readily take up the pulverized material in the drum and the air in such condition is again withdrawn from the drum through the delivery opening by the fan. The pipe 24 leading from the bottom of the separator S is arranged to deliver the material separated from the air in separator slack to be again subjected to the grinding means in the drum, in the present instance connected to a chute 31 leading from a bin for the material to be ground to means to charge material to the drum as hereinafter described.

To charge the'drum with. material to be 4 disintegrated a charging chute 37 extends through the receptacle 29 and has an inlet 38 to which the chut 31 is connected, the

material gravitating through the chute 31 and to the chute 37 maintaining the latter a closed in the operation of the apparatus. The material is positively ied through the chute 37 b a lunger 41 slidably mounted in a cylin rica portion of the chute 37 extending beyond the connection thereof with the chute 31 to pro ressively advance the material. along the chute 37. The plunger 41 is reciprocated by an eccentric 42 on a shaft 43 connected to the plunger by a rod 44, the shaft being connected to a source of power by a belt passing around a pulley 45.

For the purpose of supplying: additional air to the drum and to also reduce the force of suction of the air from the receiver 26 through the pipe 28 to the'drum with the possibility of drawing air from the receiver which has not been entirely freed of pulverized material, means are provided to connect the charging opening of the drum to the surrounding atmosphere and to control said connection. For this purpose the receptacle "29 is arranged with one or more openings the area of which openings is regulated to control the influx of air into the drum, or entirely closed, by an adjustable closure, as at 46, shown in the form of gates slidably mounted upon the receptacle. By the adjustingof the closure to open the charging opening of-the drum to the atmosphere the degree of fineness: of the material drawn by the suction means from the drum may be controlled. The volume of air rushing throughsaid openin or openings into the chargingopening ot the drum through the action of the suction means serves to agitate the air within the drum, which during the cascading- 0f the material in the drum as the latter is rotated will facilitate the assimilating or takingup of disintegrated material of varying fineness depending'upon the size .of the'opening to the atmosphere and the volume and velocity of air entering the drum. p

The connection ofs'thefani with the delivery opening of the drum is also arranged to be connected to the surrounding atmosphere in order toregulate-and control the suction through or from the drum. For

this purpose the receptacle'J-14 is arranged with one or more openings in the front and rear walls the areas of whichfare regulable by adjustable closures," as shown at 47, said closures being" in the form of gates slidably mounted upon the receptacle wall. By opening either one cr -more of the closures to a greater or less extent the force of the suction from the drum isdecreased and increased without impairing the delivery of the suction means. By entirely closing-the openings the suction will be greater and coarser material will consequently be drawn oil from the drum and delivered by the suc tion means, while if the opening or open ings are partially or entirely open only material pulverized to an impalpably fine state will be drawn from the drum. Furthermore, by the arrangement of the regulable openings in the connections of the suction means with the delivery and charging openings of the drum the suction means may serve as a means to draw or exhaust air from the delivery opening of the drum and deliver the air under pressure to the charging opening, or the force of the suction from the drum ma be decreased and increased without afi'ectmg the delivery of the air to the drum.

While it is not absolutely essential to the efficient operation of the apparatus the drum is preferably arranged with one or .more transverse partitions to separate the drum into two or more chambers and in which the material is delivered from one chamber to a successive chamber in a varying degree of fineness. In the present instance the drum is arranged with a single partition 48 separating the drum into two chambers 49, 50, the chamber 49 containing grinding elements or balls of somewhat larger size than the grinding elements in chamber 50. The material is preliminarily ground or disintegrated in the chamber 49 and the particles of material when ground to a certain fineness will pass through ert'orations 52 circumferentially arrange in the partition into thechamber 50, the walls of the perforations diverging from the chamber 49 to the chamber 50, whereby the clogging of said perforations by the material is prevented. The partition is arranged with a central enlarged opening 53 in line with the charging and dehveryopenings of the drum to provide a clear passage throu h the drum for the sweep of the air by-t e ,suct-ion means, and whereby any material which may be reduced to a pulverized state.

in the chamber 49 is drawn off from said chamber by the-suction means. To prevent the grinding elements from passing from one chamber into the other in the cascading movement thereof durin the revolving of the drum the partition s arranged with a deflecting surface, as at' 54, which operates to direct the grinding elements in the chamber 50 away from the o ening in the partition. To direct the grinding elements in chamber 49 from the opening a deflector is arranged around said opening, as shown at 55.

To facilitate the feeding of the grind,- ing elements to the chamber 50 a tubular chute 56 is arranged in the receptacle 14, said chute having an open end extending through the top of said receptacle with a removable closure, as at 40, and inclining downwardly through the delivery opening of the drum with the outlet openin into the drum. The grinding means may be fed to the chamber 49 through an air inlet open-.

ing 46 in the chamber 29 to the charging chute 37 from which they are delivered into the chamber 49.

To further control the delivery of verized material of a predetermined ness regulable means are arranged in the separator S, this separator bein in the nature of what is commonly terme a Cyclone separator, the connection of the prpe 23 If netherewith leading from the suction -fan being substantially tangential to the periph' eral wall of said chamber adjacent the to and above the convergingbottom Wall. wit the outlet pipe leadingcentrally from, the top. To separate material of var ingfderees of 'fineness from the materia carried y the air in its passage through said separator the outlet pipe 25 has a tubular extension 57 adjustablyrconnected thereto to extend into the separator chamber and adapted to have adlustment into and out 4 from. the pipe 25. This outlet pipe exten sion 57 is adjustably mounted to have telescoping movement into the pipe 25 by rods 58 circumferentially disposed around the.

pipe and secured at one end to angle brackets 59, said rods passing up through the top wall of the. separator and havin nuts 60 threaded thereon at the'outside an rest-' ing upon the top of the separator as clearly shown in Figure 4-. It will be'obvious that by adjusting the nuts on the pipe supporting rods that the pipe extension may extend into the separator variable. distances. The

llltl air in its passa e through the separator must pass aroun the pipe extension, down into the separator chamber and then up.

through the outlet pipe, and the extent to which the ipe extension extends into the separator ciamber willcontrol the degree of fineness of material.separated from the either of the bins 27 to deliver any material which may be separated from the air pass-.

in through said separator.

n the modification shown in Figures 6 and 7 a series of separators 61, 62, 63' and 64" are connected in circuit with the Pneumatic or suction means between the pipe 23 leading from the delivery side of the fan and the pipe 28, the successive separators being of increased size relative to the preceding separator whereby the force of the air is decreased at successive stages or steps,

neoaeee and material delivered at said stages or steps of varying or successive degrees of lineness, a receiver or bin, shown as bags at 65 and 66 connected to the separator 61?, 62, being arranged at the outlets of each of the separators to receive the material separated from the air in its assage through the successive separators. he separator 61 of the least capacity is connected by a pipe 67 with the'separator 62 which is of increased capacity relative to the separator 61. The separator 62 is connected by a pipe 68 with the separator 63*.of increased capacity relative to the separator 62, and the separator 63 is connected by av ipe 69 with the separator 64 of increas size relative to the separator 63. The separator 64 corresponds to receiver 26 in the arrangement shown in Figure 1 to which the return pipe 28 is connected. An auxiliary separator 70, similarto the separator 61 in Figure 1, may be connected in circuit with the return pipe 28 by a pipe 71 of restricted area, the separator having an outlet to the atmosphere through a ipe 72, and an outlet pipe '73 which may sad to the receiver for the separator 64". Either one or all of the separators, 61, 62 63* or 64; may be constructed with the ad ustable extension of the outlet pipe shown in Figure 4 whereby to regulate the degree of finenessiof the material separatedgrom'the air in its passage through said separator.

Variations may be resorted to within the scope of my invention and portions of the invention may be used without others.

Having thus described my invention I claim:

1. In disintegrating apparatus, a drum arran ed with tubular trunnions axially at opposite ends to revolubly support the drum in horizontal position, freely moving grinding elements in the drum, and means to engage in the trunnions to reducethe size of the trunnion openings, said means comprising an annular plate to engage at the outer ends of the trunnions and having an annular web arranged to extend ata re-en tering an 'le relative to the axis of the drum.

2. In disintegrating apparatus, a cylindrical drum with fuel moving grinding elements therein, said rum having hollow. trunnions at opposite ends to rotatably support the drum one of which openings constitutes a charging opening and the other a delivery opening, with suction means connected in circulation with said trunnions to draw air through and deliver disintegrated material from the drum, means in the circulatory connection of the suction means to se arate and return coarse particles of material to the drum, and means regulatably arranged in either one or both of the connections of the suction means with the drum trunnions to control either the influx or efilux of air or both simultaneously to and from the drum.

3. In disintegratin ap aratus, the combination of a revolu ble m, with freely moving grinding elements therein and having openings at op osite ends one of which openings is adapte for the .charging of material therethrough to the drum; suction means leading from one of said openings and to the other openin of the drum; a receiver.

delivery opening of the drum and to the charging opening thereof; a receiver for materia de ivered by the suction means interposed between the delivery of the suc-.

tion means and the connection thereof with the charging'opening of the drum; said connections of the suction means with the drum having justab e closures to re ulate the-size of the openings and thereby the influx and efiiux of air to and from the drum; and means to feed material to be disintegrated through the charging opening of the drum constructed and arranged to 'maintain the charging opening shut 01? from the atmosphere.

5. In. disintegrating apparatus, the combination of a revoluble drum having chargingand delivery openings; grinding means within the drum; suction means to deliver disintegrated material from the drum; means to connect the suction means to the delivery opening'of the drum having an opening to openings to the atmosphere with adthe atmosphere with an adjustable closure adapted for feeding material to the drum and the other for delivery of disintegrated material from the drum: suction means connected to and leading from the delivery opening of the drum; a receiver for disintegrated material connected to the delivery end of the suction means; air outlet means from said receiver leading to the feeding opening of the drum and having a substantially airtight connection with the drum; and regulatable means in the connection of the suction means with the delivery opening of the drum to control the efllux of air from the drum.

7. In disintegrating apparatus, the combination with a revoluble drum with gr1nding elements therein and having charging and delivery openings axially at opposite ends, of suction means connected to and leading from the delivery opening of the drum; a receiver for disintegrated material connected to the delivery side of the suction means; a pipe leading from said receiver and having a substantially air-tight connection with the charging opening of the drum to return the air from the receiver to the drum; and a separator interposed in the con-a nection of the suction means and receiver having an outlet connected to the charging opposite ends, and freely mov ng grinding elements therein, of suctlon means having a substantially air-tight connection with the delivery opening to draw air with disintegrated material from the drum; a receiver to .which disinte ated material is dematerial to the drum having a substantially air-tight connection with the charging openin of the drum; and means to control the infiux of air to and the efllux of air from the drum through the action of the suction means. a

9. In pulverizing apparatus, the combination with a revoluble drum having openings axially at opposite ends, of means in substantially air-tight connection with one of said openings to feed material therethrough to the drum; and suction means havinga substantially air-tight connection with the other opening to draw and deliver pulverized material from the drum, said connec- .tion of the suction means with the drum having an opening to the atmosphere with a regulable closure'for controlling the suction from the drum.

10. In pulverizing apparatus, the combination with a revoluble tubular drum with freely moving grinding elements therein and said connections of the feeding and suction fan with the drum having openings withv regulable closures to control the influx of air to and efilux of air from the drum.

11. In ulverizin apparatus, the combination 0 a revolu 1e tubular drum with freely moving grinding elements therein and ,having-charglng and delivery openings axially at op osite ends; suction means having a substantially air-tight connection with and with the drum for feeding the grinding elements thereto.

12. In pulverizing apparatus, the combination with a revoluble tubular drum with freely moving grinding elements therein and having charging and delivery openings at opposite ends; of a receptacle at each end of and in communication with the drum openings with means to maintain a substantially air-tight connection between the drum and receptacles; means to feed material to the drum through the receptacle connected to the charging opening and maintain said receptacle shut off from the atmosphere; a suction fan connected to thereceptacle at the delivery end of the drum to draw air with pulverized material from the drum; a receiver for the air pulverized material connected to the delivery side of the fanand arranged to separate pulverized material from the air; an air return pipe leadin from the receiver to the receptacle connect regulatable means arran ed in' the recepefflux'of air from the drum.

13. In pulverizing apparatus, the combination with a revoluble tubular drum, with means therein for grinding material and having hollow supporting trunnions to serve as charging and delivery openings at opposite ends with the inner walls arranged at an angle to re-enter material into the drum entering said trunnions, of a closed receptacle at each end of the drum in communication withthe trunnions with which the drum has a sliding joint and substantially air-tight connection; means to deliver material to the drum through the receptacle connected to the charging trunnion; a suction fan connected to the receptacle at the delivery end zoo to the charging opening of the-drum; and j of the drum to draw air and deliver pulverized material from the drum; a receiver for the pulverized material connected to the delivery side of the fan; an air return pipe from said receiver to the receptacle at the charging end of the drum; and a separator interposed between the delivery. Side of the fan and receiver and having an outlet connected to the charging opening of the drum adjustable means to adapt 't e same to sepa-' ing and delive connected in circuit with chargingand de-- livery opemngs'of said drum to deliver material from the drum; a separator interposed in said pneumatic means to separate material from the air delivered by the pneumatic means, said separator bein arranged with rate material of different degrees of finenessvfrom the air and have connection with the drum for returning coarse material to the drum; and a receiver connected 1n the pneumat1c means to'recelve material from sald separating means. a

15. In disintegrating apparatus, the combination-with a drum arranged with means therein to grind material; and having charging and delivery openin s, of neumatic means in circulation wit the c arging and delivery openings of the drum to deliver disintegrated material from the drum; and means connected 1n circulation with the pneumatic means at the delivery side of the pneumatic means to separate material of variable degrees of fineness from the air delivered by the pneumatic means, comprising achamber into Which the pneumatic means delivers at the side, an outlet pipe leading from the top ofthe chamber in a line transverse to the delivery of the air into the chamber, an auxiliary pipe having a telescoping connection with the outlet pipe and adapted to be extended variable distances into the chamber, and an outlet leading from the bottom of said chamber to the charging opening of the drum' for the separated material.

16. In disintegrating apparatus, the combination with a drum arranged with means therein to grind material; and having chargopenings, of penumatic means connecte in circulation with the charging and delivery openings of the drum to deliver disintegrated material from the drum; and means connected in circulation with the pneumatic means at the delivery side of the pneumatic means to separate material of variable degrees of coarseness from the air delivered by the pneumatic means, comprising a cylindrical casing havin a chamber therein with the wall convergmg toward the bottom and having an outlet at the apex of said converging wall, the connection of the pneumatic means with said casin being tangential with the peripheral wa 1 thereof, an air outlet pipe leading from the top of said casing, and an auxiliary pipe.

having telescoping connection with the outlet pipe and adapted to be extended variable.

distances into the casing chamber. 17. In disintegrating apparatus, a revoluble drum in which to disintegrate material having charging and delivery openings, pneumatic means connected in circulation with the drumincluding a fan to deliver pulverulent material from the drum, and regulatable means tovariably open the char ing end of the drum and the intake of the anto the atmosphere operative to regulate the drawing of' air with ulverulent material from the drumby the an without impairing the intake of air to or delivery and lift of the airfrom .the'famf 18. In disinte rating apparatus, arevolubledrum in whlch to disintegrate material having charging and delivery openings, pneumatic means connected in circulation with the drum including a fanto deliver pulverulentflmaterial from the drum, means interposed inthe pneumatic means'to sephere at the charging end of the drum' and intake to the fan, and regulatable means for arate pulverulent' material from the airde- I a livered by the fan, openingsvto the atmos-I said opening to vary the area of the-o ening thereof 'to the atmosphere to re the influx of alr tothe drum ande ux of ateeo j

air with pulverized material 'ofvariable fine-' ness irom the drum while maintaining the intake of air'to the fan as well as the delivery and lift-of air from the fan constant; 19. In pulverizing apparatus,a drum in which to disintegrate material having charging and delivery openings at opp n .a

means to feed material through thech'argmg opening of the drum, pneumatic means connected in circuit with the drum todeliver material from the drum, a separator interposed in said pneumatic means to 'efiect a primary separation of material from the air drawn from the drum by the pneumatic means, sald separator being arranged with adjustable means to "separate material of variable degrees of fineness from; the air and having connection with the drum for returning to the drum material separated from the air in said separator, and a collecting separatonfconnected in the pneumatic means to receive the air from the primary separator. A. 20. In pulverizing apparatus, a revoluble drum, in which to disintegrate material hav ing charging and delivery openings at o p'o-o site ends, means to feed material to the rum through the. charging opening, pneumatic a primary separation of material from the air drawn from the drum by the pneumatic means, said separator having an outlet pipe, a sleeve slidable longitudinally of said outlet pipe and adjustable variable distances into the separator and operative to efi'ect fineness from the air in its passage through said separator, and the separator having a separation of material of variable degrees of connection with the drum for returning to connected in the pneumatic means to receiveair from the primar separator.

21. In disintegrating apparatus, arevoluble drum in which to disintegrate material having charging and delivery openings, pneumatic means connected to the delivery opening 'of said drum to deliver material from the drum, a separatoramterposed in said pneumatic means to separate material from the air drawn from the drum by the pneumatic means including a chamber having an inlet forthe dust laden air from the 15 drum, a connection with the drum to' return material to the drum separated from the air in its passage through said chamber, an outletpipe for the air, and a sleeve telescopable relative to the outlet .pipe and adjustable to 20 variable extent into the chamber to efl'ect separation of material of-variable degreesof fineness from the air in its passage through thechamben. p

Signed at the city of New York, in the 25 county of New York and State of New York, this 2nd day of October 1922..

JOSEPI-l E. KENNEDY. 

